This is Wikipedia's tip library. Here you can digest how to use Wikipedia in bite-sized morsels. The tips listed below were created for the Tip of the day project, but are listed here by title and organized by subject area for your convenience.
Wikipedia uses the Ogg Vorbis, FLAC and WAV formats for audio, as they are not encumbered by patents (an issue that prompted the decision that MP3 files will not be hosted at Wikipedia). Software supporting Vorbis exists for many platforms...
Various online tools (such as Zamzar) are available which let you freely convert one file format into another, and can be useful when you want to upload a file to Wikipedia.